Most of the breeds listed in the Wikipedia articles are fancy breeds of ducks and chickens raised mainly as a hobby by breeders for show. They are not meat breeds, but can be eaten, however, they wouldn't be sold on a large scale. In Ontario and most of North America, you will mostly find Cornish X chickens and Pekin ducks. Both breeds are fast growers and provide good meat by 8 weeks. I don't live in the GTA, so I haven't been to a Chinese supermarket there, but I've heard that Silkie breed chickens are sold and they have a blue/grey skin.